17 V, 2.25 MHz, Synchronous Step-Down Regulator Delivers 2 A and Requires 3.5 µA of Quiescent Current

tn.jspThe LTC3624 is a high efficiency, 17 V input capable synchronous buck regulator from Linear Technology that delivers up to 2 A of continuous output current to outputs as low as 0.6 V. Synchronous rectification delivers efficiencies as high as 95 percent while Burst Mode operation requires 3.5 µA of no load quiescent current. The LTC3624 switches at a fixed 1 MHz frequency, whereas the LTC3624-2 switches at 2.25 MHz. Their constant frequency, current-mode architecture minimizes switching noise while offering fast line and load transient response. The LTC3624/-2 operates from an input voltage range of 2.7 V to 17 V, making it well suited for single cell or multi- cell Li-Ion stack inputs as well as 12 V intermediate bus-powered systems. The combination of its 3 mm by 3 mm DFN package, high switching frequency and low cost capacitors and inductors ensures a compact solution footprint.

The LTC3624/-2’s 60ns minimum on-time enables it to step-down 16 V inputs to 2.5 V with a 2.25 MHz switching frequency (LTC3624-2) without pulse skipping, minimizing the size of external components thus offering a very compact, high efficiency 2 A step-down solution. It’s 3.5 µA quiescent current make it well suited for always-on applications demanding maximum battery run time. For applications requiring the lowest possible noise, the LTC3624/-2 can be configured to run in pulse-skipping or forced continuous mode, reducing noise and potential RF interference. Additional features include a power good voltage monitor, internal compensation and thermal protection.

The LTC3624EDD and LTC3624EDD-2 are available in a 3mm x 3mm DFN-8 package, priced at $2.95 each in 1,000-piece quantities. Industrial grade versions, the LTC3624IDD and the LTC3624IDD-2 are guaranteed to operate over the -40°C to 125°C operating junction temperature range, priced at $3.25 each in 1,000-piece quantities.